Sectional lining for rotary furnaces



W. S. ROCKWELL. SECTION/AL LINING FoR'RoTARY FuRNAcEs.

APPLICATION FILED SEPT. 8,1919.

Patented feb; 10, 1920.

2 SHEETS-SHEEI l.

W. S. ROCKWELL.

SECTION/IL L|N|NG FOR ROTARY FURNACES.

APPLICATION FILED SEPT. 8, |919. y 1,330,219. Patented Feb. 10,1920.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

WALTER s. EOCEWELL, or NEW YOEK, N. Y., AssIeNoR To W. s. ROOKWELL COMPANY, or NEW YORK, N. Y., E CORPORATION or NEW JERSEY.

SECTION'AL LININGFOR ROTARY FURNACES.

To all whom t may concern:

Be it known that I, WALTER S. ROOKWELL, a citizen of the United States, residing lat 300 West 106th street, New York, county of New York, and State of New York, have invented certain new and useful Improvements in Sectional Linings for Rotary Fur.

naces, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The present invention relates to an improved means of providing a cylindrical rotary furnace with an interior spiral rib, to produce a spiral channel for` automatically conveying the material to be heated from one end of the furnace to the other when the furnace is rotated.;

A .furnace of this classl lined with firebrick nd provided with means for automatica y conveying the -material through the furnace-chamber is shown in my Patent No. 940,280, issued November 16, 1909, the spirally )disposed rib being formed therein vOf clay-tile, inserted between the courses of the brick-lining.

With such construction, the material rolls or slides continuously upon the surface of the highly heated brick-lining in contact'with the tile-rib, and as the material to be heated ma v consist of iron, steel or other metallic artlcles, they necessarily abrade the surface of' the tile and cause such. a deterioration that the lining and rib require frequent renewal.

The Object of the present invention is to avoid such rapid deterioration, and this is effected by applying a metallic shell to the inner surface of the brick or other refracf tory lining, and forming the spiral rib integral with such metallic shell. f

Tov facilitate .the application of such me-4 tallic shellvto the interiorv of the furnace tions each iso Such furnaces are highly heatedby gas-or oil fuel and the shell thus protects the rickliningI fromv too destructive heat land abra-- sion, and the ribs pro]ecting from the shell form a spiral channel the walls of which are formed wholly of metal, and -thus en- ,abled better to resist the abrasive action of Patented Feb. 1o, 1920.

the stock in its movement through the channel as the furnace rotates.

If the sections of the inner shell were made i vright-angles; which preserves the entire strength of the coils where the ends are matched and abutted together.

The sections may obviously be provided with more than one coil of the ribs, but the formation of the sections by casting is greatly facilitated by forming them with only one coil, and the entire inner shell of the brick ylining can thus be formed of uniform sections excepting at the eXtreme ends, where the brick-work and its shell extend to the'inlet and outlet of the furnace.

Sections of special form are required at these points, as will be understood by reference to the annexed drawing, which shows the rotary body of the furnace provided with a stationary hood at its outlet-end and an annular steam-chamber attached to the shell of the furnace to'maintain a steamatmosphere over the j ointA of the furnace and hood, so asto prevent the access of a1r which might oxidize the heated articles of the stock -as they are discharged from the furnace. 7

atl the left-hand end lof. the furnace; Fig. 3v

shows the same sections of shell divided horizontally upon the center line; Fig. 4

shows theoutlet-end of the furnace with its steam-chamber and a part of the contiguous hood; and Fig.` 5 shows the outlet-end of the furnace-body with the hood removed,

thus exposing the interior of the steamchamber.

The furnace is shown with a cylindrical shell 1 having a brick-lining 2. A conical hopper or feeding-drum -3 is attached to the inlet-end into which the material a is delivered, as in my- Patent No. 940,280. The

material enters one end of the channel 4, which is formed by the spiral r1b 5, upon- A length, the same pattern can be utilized for the interior of the cylindrical sections 6 which form a protective shell for the bricklining 2.

Fig. 1 shows four similar sections of the cylindrical shell, each provided with one coil of the rib 5; and end-sections of special character. The four sections have their opposite ends offset in opposite directions so as to intersect respectively the opposite ends of the coils on such sections. These sections are so proportioned that when their offset ends are matched or abutted together theJ successive coils of the rib forma continuous rib and a continuous spiral channel upon the inner side of the furnace-chamber. Lach offset forms a division in the rib.

The end-sections are offset upon one end only, the opposite end being plane'in agreement with the flanges 7 which are attached to the inlet and outlet-ends of the shell.

These end-sections are provided with more or less than one coil of the rib, which at one end joins the coils upon the adjacent sections, and at the opposite end is so disposed as to receive the material from the feeding-drum, or discharge it from the outlet 8 of the furnace.

If the' end-sections be made of .equal casting both` the sections, but they would be applied to the intervening sectionsin a reverse relation, as is clearly shown 'in Fig. 1.

The left-hand end of Fig. l shows the stock in the form of round balls entering the channel 4, and the right hand end shows such balls in the bottom of the channel at the outlet, where they would be pushed gradually into the hood 9 by the end of the coil shownin the upper part of the outlet 8.

The casing is formed as usual with annular bearing-rings 10 supported upon antifriction rolls 11, and is rotated by any suitable means.

The hood is stationary and is provided. at its bottoni with a chute 20, and upon its inner side with a circular plate 12 conti uous to the end of the casing, and exten s outwardly beyond the periphery of nthe casing suiiclentl to close the mouth of an annular steam-c amber 13 built upon the outlet-end of the casing.

't is evident that no close joint can be maintained between the end of'the casing and the hood, and air. would be liable to penetrate through an open joint and cause oxidation of the articles heated in the furnace in their passage to the chute. To prevent such intrusion of air is the function of the steam-chamber referred to.

The steam-chamber is open on the side toward the plate 12, which extends beyond the periphery of the steam-chamber Sulliciently o sustain a guard-ring 14, which is shown in the form of an angle-iron, one flange of which is at'tached to the plate 12 and the other flange overlaps the periphery of the steam-chamber.

A steam-pipe 15 is inserted through the overlapping flange of the guard to keep the steam-chamber Hlled with steam, which thus flushes and protects the joint between the revolving casing and the hood from any intrusion of air. The use of steam for thus closing the joint produces no frictional resistance to the rotation of the casing, while it protects the joint effectively.

A burner-inlet 16 is shown upon the hood above the chute, and a burner 17 is located at such inlet and its nozzle directed length- Wise of the furnace-chamber-so as to drive the flame throughout its entire length.

The chute may be operated in any usual manner, as to discharge the material into any suitable receptacle or into a quenching tank. The nozzle of the chute may, if desired, be sealed by extending it under the surface of a liquid so as to quench the articles before they are at all exposed to the atmosphere.

Having thus set forth the nature of the invention what is claimed herein is:

1. A cylindrical rotary furnace having a refractory lining and sections of ametallic shell fitted endwise within the said lining and provided each with one or more spiral.

coils of an inwardly projecting rib, /the cylindrical sections being so disposed within the lining as to arrange the several single .coils in a continuous spiral ,line throughout the length of the furnace, to form a spiral channel therein with entirely metallic walls.

2. A cylindrical rotaryv furnace having a refractory lining and sections of a metallic cylinder fitted endwise Within the said lining and provided each with Ia spiral coil,

and the opposite ends of each section oHset with a spiral coil of inwardly projecting rib terminating .'at opposite'ends of the section, the ends of the section being offset in opposite directions transverse to the ends of the said coil, andthe ends of the sections being suitably matched together within the lining to form av continuous spiral rib and channel and a continuous covering for the lining between the spiral ribs.

4. lA rotary furnace having a refractory lining and an inlet revolved therewith 'at one end and an 'outlet revolved therewith at the opposite' end, a stationary hood having a chamber connecting with the said outlet and provided with a delivery-chute, and

a spiral rib upon the lining ofthe shell forming a conveying channel from the inlet to the outlet and extended close to the hood to deliver the material positively to the chamber therein.

5. A rotary furnace having a cylindrical casing with refractory lin-ing and an inlet revolved therewith at one end and outlet revolved therewith at the opposite end, a stationary hood having a chamber connecting with the said outlet and having a delivery-chute extending from its lower side, and a burner-inlet upon its outer side w-ith a burner projected toward the bore of th furnace to heat the same.

6. A rotary furnace having a cylindrical casing with refractory lining and an inlet revolved therewith at one end and an outlet revolved therewith at the opposite end, a stationary hood having a chamber connecting with the said outlet and provided with a delivery-chute, an annular steam-chamber encircling the joint of the cylindrical shell with the hood, and means for supplying steam to the same to flush the said joint and prevent the access of air thereto.

7. A rotary furnace having a cylindrical casing with refractory lining and an inlet revolved therewith at one end and an outlet revolved therewith at the opposite end, a stationary hood having a chamber connecting with the said outlet and provided with a deliverychute, an annular flange upon the hood overlapping the adjacent end of the steam-chamber, and a steam-pipe extended through the flange to flush the joint of the casing and hood, for the purpose set forth.

8. A rotaryjfurnace having a cylindrical casing with refractory lining and an inlet revolved therewith at one end and an outlet revolved therewith at the opposite end, a stationary hood having a chamber connecting with the said outlet and provided with a delivery-chute7 a circular plate upon the hood opposed to the end of the cylindrical shell, an annular steam-chamber upon the casing opening toward the said plate over the joint of the casing and plate, and an annular flange upon the plate covering the joint of the steam-chamber and plate, and means to supply steam through the said flange to the interior of the steam-chamber. In testimony whereof I have hereunto set my hand.

WALTER s. RocKwnLrl 

